Explicitly set model_max_length in the tokenizer config.

tokenizer_config.json

@@ -1 +1 @@
-{"bos_token": "[CLS]", "eos_token": "[SEP]", "sep_token": "[SEP]", "cls_token": "[CLS]", "unk_token": "[UNK]", "pad_token": "[PAD]", "mask_token": "[MASK]", "add_prefix_space": false}
+{"bos_token": "[CLS]", "eos_token": "[SEP]", "sep_token": "[SEP]", "cls_token": "[CLS]", "unk_token": "[UNK]", "pad_token": "[PAD]", "mask_token": "[MASK]", "add_prefix_space": false, "model_max_length": 512}